/usr/lib/ghc-doc/hoogle/esqueleto.txt is in libghc-esqueleto-doc 1.3.4.2-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-esqueleto-doc/html/esqueleto.txt